Spoofing is when traders create the illusion of pessimism (or optimism) in the market by placing big buy/sell orders without the intention of filling them. They often pair this with “wash sells and buys” (wash buying/selling),  buying and selling their own orders for little or no profit or loss. Further, this generally pairs with large orders set strategically above and below the market price to control the price range.[1][2][3][4]

TIP: Loosely speaking, Spoofing can also called Ghosting, Wash Selling, or Layering. Those terms can have unique meaning based on context, but the concept is generally the same.

: Definition from Cryptocurrencyfacts. com